﻿<%
'######################################################################
'## easp.md5.asp
'## -------------------------------------------------------------------
'## Feature     :   MD5 Encryption
'## Version     :   v2.2 Alpha
'## Author      :   Coldstone(coldstone[at]qq.com)
'## Update Date :   2010/10/20 23:57:57
'## Description :   Encrypt strings with MD5 in EasyASP
'##
'######################################################################
Private Const BITS_TO_A_BYTE = 8
Private Const BYTES_TO_A_WORD = 4
Private Const BITS_TO_A_WORD = 32
Class EasyAsp_md5
    Private m_lOnBits(30)
    Private m_l2Power(30)
     
    Private Function LShift(lValue, iShiftBits)
        If iShiftBits = 0 Then
            LShift = lValue
            Exit Function
        ElseIf iShiftBits = 31 Then
            If lValue And 1 Then
                LShift = &H80000000
            Else
                LShift = 0
            End If
            Exit Function
        ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
            Err.Raise 6
        End If
    
        If (lValue And m_l2Power(31 - iShiftBits)) Then
            LShift = ((lValue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or &H80000000
        Else
            LShift = ((lValue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits))
        End If
    End Function
    
    Private Function RShift(lValue, iShiftBits)
        If iShiftBits = 0 Then
            RShift = lValue
            Exit Function
        ElseIf iShiftBits = 31 Then
            If lValue And &H80000000 Then
                RShift = 1
            Else
                RShift = 0
            End If
            Exit Function
        ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
            Err.Raise 6
        End If
        
        RShift = (lValue And &H7FFFFFFE) \ m_l2Power(iShiftBits)
    
        If (lValue And &H80000000) Then
            RShift = (RShift Or (&H40000000 \ m_l2Power(iShiftBits - 1)))
        End If
    End Function
    
    Private Function RotateLeft(lValue, iShiftBits)
        RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))
    End Function
    
    Private Function AddUnsigned(lX, lY)
        dim lX4
        dim lY4
        dim lX8
        dim lY8
        dim lResult
     
        lX8 = lX And &H80000000
        lY8 = lY And &H80000000
        lX4 = lX And &H40000000
        lY4 = lY And &H40000000
     
        lResult = (lX And &H3FFFFFFF) + (lY And &H3FFFFFFF)
     
        If lX4 And lY4 Then
            lResult = lResult Xor &H80000000 Xor lX8 Xor lY8
        ElseIf lX4 Or lY4 Then
            If lResult And &H40000000 Then
                lResult = lResult Xor &HC0000000 Xor lX8 Xor lY8
            Else
                lResult = lResult Xor &H40000000 Xor lX8 Xor lY8
            End If
        Else
            lResult = lResult Xor lX8 Xor lY8
        End If
     
        AddUnsigned = lResult
    End Function
    
    Private Function md5_F(x, y, z)
        md5_F = (x And y) Or ((Not x) And z)
    End Function
    
    Private Function md5_G(x, y, z)
        md5_G = (x And z) Or (y And (Not z))
    End Function
    
    Private Function md5_H(x, y, z)
        md5_H = (x Xor y Xor z)
    End Function
    
    Private Function md5_I(x, y, z)
        md5_I = (y Xor (x Or (Not z)))
    End Function
    
    Private Sub md5_FF(a, b, c, d, x, s, ac)
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_F(b, c, d), x), ac))
        a = RotateLeft(a, s)
        a = AddUnsigned(a, b)
    End Sub
    
    Private Sub md5_GG(a, b, c, d, x, s, ac)
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_G(b, c, d), x), ac))
        a = RotateLeft(a, s)
        a = AddUnsigned(a, b)
    End Sub
    
    Private Sub md5_HH(a, b, c, d, x, s, ac)
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_H(b, c, d), x), ac))
        a = RotateLeft(a, s)
        a = AddUnsigned(a, b)
    End Sub
    
    Private Sub md5_II(a, b, c, d, x, s, ac)
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_I(b, c, d), x), ac))
        a = RotateLeft(a, s)
        a = AddUnsigned(a, b)
    End Sub
    
    Private Function ConvertToWordArray(sMessage)
        dim lMessageLength
        dim lNumberOfWords
        dim lWordArray()
        dim lBytePosition
        dim lByteCount
        dim lWordCount
        
        Const MODULUS_BITS = 512
        Const CONGRUENT_BITS = 448
        
        lMessageLength = Len(sMessage)
        
        lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) \ BITS_TO_A_BYTE)) \ (MODULUS_BITS \ BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS \ BITS_TO_A_WORD)
        Redim lWordArray(lNumberOfWords - 1)
        
        lBytePosition = 0
        lByteCount = 0
        Do Until lByteCount >= lMessageLength
            lWordCount = lByteCount \ BYTES_TO_A_WORD
            lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
            lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(Asc(Mid(sMessage, lByteCount + 1, 1)), lBytePosition)
            lByteCount = lByteCount + 1
        Loop
    
        lWordCount = lByteCount \ BYTES_TO_A_WORD
        lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
    
        lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(&H80, lBytePosition)
    
        lWordArray(lNumberOfWords - 2) = LShift(lMessageLength, 3)
        lWordArray(lNumberOfWords - 1) = RShift(lMessageLength, 29)
        
        ConvertToWordArray = lWordArray
    End Function
    
    Private Function WordToHex(lValue)
        dim lByte
        dim lCount
        For lCount = 0 To 3
            lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1)
            WordToHex = WordToHex & Right("0" & Hex(lByte), 2)
        Next
    End Function
    
    Private Function MD5(sMessage, bit)
        m_lOnBits(0) = CLng(1)
        m_lOnBits(1) = CLng(3)
        m_lOnBits(2) = CLng(7)
        m_lOnBits(3) = CLng(15)
        m_lOnBits(4) = CLng(31)
        m_lOnBits(5) = CLng(63)
        m_lOnBits(6) = CLng(127)
        m_lOnBits(7) = CLng(255)
        m_lOnBits(8) = CLng(511)
        m_lOnBits(9) = CLng(1023)
        m_lOnBits(10) = CLng(2047)
        m_lOnBits(11) = CLng(4095)
        m_lOnBits(12) = CLng(8191)
        m_lOnBits(13) = CLng(16383)
        m_lOnBits(14) = CLng(32767)
        m_lOnBits(15) = CLng(65535)
        m_lOnBits(16) = CLng(131071)
        m_lOnBits(17) = CLng(262143)
        m_lOnBits(18) = CLng(524287)
        m_lOnBits(19) = CLng(1048575)
        m_lOnBits(20) = CLng(2097151)
        m_lOnBits(21) = CLng(4194303)
        m_lOnBits(22) = CLng(8388607)
        m_lOnBits(23) = CLng(16777215)
        m_lOnBits(24) = CLng(33554431)
        m_lOnBits(25) = CLng(67108863)
        m_lOnBits(26) = CLng(134217727)
        m_lOnBits(27) = CLng(268435455)
        m_lOnBits(28) = CLng(536870911)
        m_lOnBits(29) = CLng(1073741823)
        m_lOnBits(30) = CLng(2147483647)
        
        m_l2Power(0) = CLng(1)
        m_l2Power(1) = CLng(2)
        m_l2Power(2) = CLng(4)
        m_l2Power(3) = CLng(8)
        m_l2Power(4) = CLng(16)
        m_l2Power(5) = CLng(32)
        m_l2Power(6) = CLng(64)
        m_l2Power(7) = CLng(128)
        m_l2Power(8) = CLng(256)
        m_l2Power(9) = CLng(512)
        m_l2Power(10) = CLng(1024)
        m_l2Power(11) = CLng(2048)
        m_l2Power(12) = CLng(4096)
        m_l2Power(13) = CLng(8192)
        m_l2Power(14) = CLng(16384)
        m_l2Power(15) = CLng(32768)
        m_l2Power(16) = CLng(65536)
        m_l2Power(17) = CLng(131072)
        m_l2Power(18) = CLng(262144)
        m_l2Power(19) = CLng(524288)
        m_l2Power(20) = CLng(1048576)
        m_l2Power(21) = CLng(2097152)
        m_l2Power(22) = CLng(4194304)
        m_l2Power(23) = CLng(8388608)
        m_l2Power(24) = CLng(16777216)
        m_l2Power(25) = CLng(33554432)
        m_l2Power(26) = CLng(67108864)
        m_l2Power(27) = CLng(134217728)
        m_l2Power(28) = CLng(268435456)
        m_l2Power(29) = CLng(536870912)
        m_l2Power(30) = CLng(1073741824)
    
        dim x
        dim k
        dim AA
        dim BB
        dim CC
        dim DD
        dim a
        dim b
        dim c
        dim d
        
        Const S11 = 7
        Const S12 = 12
        Const S13 = 17
        Const S14 = 22
        Const S21 = 5
        Const S22 = 9
        Const S23 = 14
        Const S24 = 20
        Const S31 = 4
        Const S32 = 11
        Const S33 = 16
        Const S34 = 23
        Const S41 = 6
        Const S42 = 10
        Const S43 = 15
        Const S44 = 21
    
        x = ConvertToWordArray(sMessage)
        
        a = &H67452301
        b = &HEFCDAB89
        c = &H98BADCFE
        d = &H10325476
    
        For k = 0 To UBound(x) Step 16
            AA = a
            BB = b
            CC = c
            DD = d
        
            md5_FF a, b, c, d, x(k + 0), S11, &HD76AA478
            md5_FF d, a, b, c, x(k + 1), S12, &HE8C7B756
            md5_FF c, d, a, b, x(k + 2), S13, &H242070DB
            md5_FF b, c, d, a, x(k + 3), S14, &HC1BDCEEE
            md5_FF a, b, c, d, x(k + 4), S11, &HF57C0FAF
            md5_FF d, a, b, c, x(k + 5), S12, &H4787C62A
            md5_FF c, d, a, b, x(k + 6), S13, &HA8304613
            md5_FF b, c, d, a, x(k + 7), S14, &HFD469501
            md5_FF a, b, c, d, x(k + 8), S11, &H698098D8
            md5_FF d, a, b, c, x(k + 9), S12, &H8B44F7AF
            md5_FF c, d, a, b, x(k + 10), S13, &HFFFF5BB1
            md5_FF b, c, d, a, x(k + 11), S14, &H895CD7BE
            md5_FF a, b, c, d, x(k + 12), S11, &H6B901122
            md5_FF d, a, b, c, x(k + 13), S12, &HFD987193
            md5_FF c, d, a, b, x(k + 14), S13, &HA679438E
            md5_FF b, c, d, a, x(k + 15), S14, &H49B40821
        
            md5_GG a, b, c, d, x(k + 1), S21, &HF61E2562
            md5_GG d, a, b, c, x(k + 6), S22, &HC040B340
            md5_GG c, d, a, b, x(k + 11), S23, &H265E5A51
            md5_GG b, c, d, a, x(k + 0), S24, &HE9B6C7AA
            md5_GG a, b, c, d, x(k + 5), S21, &HD62F105D
            md5_GG d, a, b, c, x(k + 10), S22, &H2441453
            md5_GG c, d, a, b, x(k + 15), S23, &HD8A1E681
            md5_GG b, c, d, a, x(k + 4), S24, &HE7D3FBC8
            md5_GG a, b, c, d, x(k + 9), S21, &H21E1CDE6
            md5_GG d, a, b, c, x(k + 14), S22, &HC33707D6
            md5_GG c, d, a, b, x(k + 3), S23, &HF4D50D87
            md5_GG b, c, d, a, x(k + 8), S24, &H455A14ED
            md5_GG a, b, c, d, x(k + 13), S21, &HA9E3E905
            md5_GG d, a, b, c, x(k + 2), S22, &HFCEFA3F8
            md5_GG c, d, a, b, x(k + 7), S23, &H676F02D9
            md5_GG b, c, d, a, x(k + 12), S24, &H8D2A4C8A
                
            md5_HH a, b, c, d, x(k + 5), S31, &HFFFA3942
            md5_HH d, a, b, c, x(k + 8), S32, &H8771F681
            md5_HH c, d, a, b, x(k + 11), S33, &H6D9D6122
            md5_HH b, c, d, a, x(k + 14), S34, &HFDE5380C
            md5_HH a, b, c, d, x(k + 1), S31, &HA4BEEA44
            md5_HH d, a, b, c, x(k + 4), S32, &H4BDECFA9
            md5_HH c, d, a, b, x(k + 7), S33, &HF6BB4B60
            md5_HH b, c, d, a, x(k + 10), S34, &HBEBFBC70
            md5_HH a, b, c, d, x(k + 13), S31, &H289B7EC6
            md5_HH d, a, b, c, x(k + 0), S32, &HEAA127FA
            md5_HH c, d, a, b, x(k + 3), S33, &HD4EF3085
            md5_HH b, c, d, a, x(k + 6), S34, &H4881D05
            md5_HH a, b, c, d, x(k + 9), S31, &HD9D4D039
            md5_HH d, a, b, c, x(k + 12), S32, &HE6DB99E5
            md5_HH c, d, a, b, x(k + 15), S33, &H1FA27CF8
            md5_HH b, c, d, a, x(k + 2), S34, &HC4AC5665
        
            md5_II a, b, c, d, x(k + 0), S41, &HF4292244
            md5_II d, a, b, c, x(k + 7), S42, &H432AFF97
            md5_II c, d, a, b, x(k + 14), S43, &HAB9423A7
            md5_II b, c, d, a, x(k + 5), S44, &HFC93A039
            md5_II a, b, c, d, x(k + 12), S41, &H655B59C3
            md5_II d, a, b, c, x(k + 3), S42, &H8F0CCC92
            md5_II c, d, a, b, x(k + 10), S43, &HFFEFF47D
            md5_II b, c, d, a, x(k + 1), S44, &H85845DD1
            md5_II a, b, c, d, x(k + 8), S41, &H6FA87E4F
            md5_II d, a, b, c, x(k + 15), S42, &HFE2CE6E0
            md5_II c, d, a, b, x(k + 6), S43, &HA3014314
            md5_II b, c, d, a, x(k + 13), S44, &H4E0811A1
            md5_II a, b, c, d, x(k + 4), S41, &HF7537E82
            md5_II d, a, b, c, x(k + 11), S42, &HBD3AF235
            md5_II c, d, a, b, x(k + 2), S43, &H2AD7D2BB
            md5_II b, c, d, a, x(k + 9), S44, &HEB86D391
        
            a = AddUnsigned(a, AA)
            b = AddUnsigned(b, BB)
            c = AddUnsigned(c, CC)
            d = AddUnsigned(d, DD)
        Next
        If bit = 16 Then
            MD5 = LCase(WordToHex(b) & WordToHex(c))
        Else
            MD5 = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))
        End If
    End Function
    Public Default Function To32(ByVal s)
        To32 = MD5(s,32)
    End Function
    Public Function To16(ByVal s)
        To16 = MD5(s,16)
    End Function
End Class
%>